Dropbox HTTP API - PHP cURL added header item boundary automatically - php

Question

I'm new with the Dropbox API integrations, and I'm using the PHP cURL extension to make calls to the HTTP REST API, and when I try to make a request I receive the following string:
Error in call to API function "files/list_folder":
Bad HTTP "Content-Type" header:
"text/plain; boundary=----------------------------645eb1c4046b".
Expecting one of "application/json", "application/json; charset=utf-8",
"text/plain; charset=dropbox-cors-hack".
I'm sending this with code very similar to this:
$sUrl = "https://api.dropboxapi.com/2/files/list_folder";
$oCurl = curl_init($sUrl);
$aPostData = array('path' => '', 'recursive' => true, 'show_hidden' => true);
$sBearer = "MY_TOKEN";
$aRequestOptions = array(
CURLOPT_POST => true,
CURLOPT_HTTPHEADER => array('Content-Type: text/plain',
'Authorization: Bearer ' . $sBearer),
CURLOPT_POSTFIELDS => $aPostData,
CURLOPT_RETURNTRANSFER => true);
curl_setopt_array($aRequestOptions);
$hExec = curl_exec($oCurl);
if ($hExec === false){
// Some error info in JSON format
} else {
var_dump($hExec);
}

Answer 1

As you have it, you're doing a multipart form upload, which isn't what the API expects.
There are a few things you need to do differently:
You should be sending up the parameters as JSON in the body.
You should set the Content-Type to application/json, accordingly.
There isn't a show_hidden parameter on /files/list_folder, but perhaps you meant to send include_deleted.
The curl_setopt_array method takes two parameters, the first of which should be the curl handle.
Here's an updated version of your code that works for me:
<?php
$sUrl = "https://api.dropboxapi.com/2/files/list_folder";
$oCurl = curl_init($sUrl);
$aPostData = array('path' => '', 'recursive' => true, 'include_deleted' => true);
$sBearer = "MY_TOKEN";
$aRequestOptions = array(
CURLOPT_POST => true,
CURLOPT_HTTPHEADER => array('Content-Type: application/json',
'Authorization: Bearer ' . $sBearer),
CURLOPT_POSTFIELDS => json_encode($aPostData),
CURLOPT_RETURNTRANSFER => true);
curl_setopt_array($oCurl, $aRequestOptions);
$hExec = curl_exec($oCurl);
if ($hExec === false){
// Some error info in JSON format
} else {
var_dump($hExec);
}
?>